BMW 3 Series Service Manual
Contents
1. CYLINDER HEAD REMOVAL AND INSTALLATION Fig 40 Cylinder head bolt loosening sequence 36 NOTE BMW special tool no 11 2 250 is a thin walled Torx E12 socket with an extended reach The cylinder head bolts are recessed into the head below the camshaft towers with little working space Remove crankshaft locking tool BMW special tool no 11 2 300 Using the crankshaft vibration damper bolt turn engine opposite its normal direction of rotation counterclockwise as viewed from the front approxi mately 45 This prevents accidental contact between valves and pistons during installation NOTE Guide cam chain to keep it from jamming when turning the crankshaft Cylinder head installing 6 cylinder engine CA U TION If the camshafts were removed and installed while the cylinder head was off a minimum waiting time is required after installing the camshafts When the camshafts are removed the hydraulic lifters can expand This expansion can cause increased valve lift when the camshafts are bolted down re sulting in open valves Cylinder head installation waiting times 68 F 20 C and higher 10 minutes 50 68 F 10 20 C o oo e cece eee 30 minutes 32 50 F 0 10 ecur se hea co tease 75 minutes 113 15 1 Clean cylinder head and gasket surfaces of cylinder block and all timing chain covers e Remove all foreign matter and any liquid from bolt holes2. then clean with a thread chaser CAUTION Do not use a metal scraper or wire brish to clean the aluminum cylinder head or pistons If neces sary use a hard wooden or plastic scraper Also available are abrasive discs to be used in conjunc tion with an electric drill Be sure to use the correct disc for the type of metal being cleaned Check gasket surface of cylinder head and cylinder block for warpage using a straight edge NOTE If the cylinder head has been machined a special 0 3 mm thicker gasket should be installed The thicker gas ket is available from an authorized BMW dealer Place new cylinder head gasket on cylinder block Check that two locating dowels are correctly Posh in block and are not damaged NOTE Sa ae The word OBEN annisa on the gasket should face up The cylinder head gasket will fit correctly in my one orientation _ With camshafts locked in TDC position with BMW spe cial tools as described earlier set cylinder head in po sition guiding primary chain rough cylinder head opening CAUTION e The camshafts must be locked in the TDC posi tion at the rear of the cylinder head with BMW special tool no 11 3 240 before steers the i inder head 3 e Make sure the ganihan which had been rotat ed approximately 45 opposite the direction of engine rotation is still in that position before low ering the cylinder head into position _ Light
3. ly lubricate new cylinder head bolts Loosely install bolts and their washers then thread them in until they are finger tight Install cylinder head to lower timing chain cover bolts finger tight CAUTION Torx type cylinder head bolts should not be re used They are stretch type bolts and must always be replaced whenever loosened CYLINDER HEAD 6 CYLINDER
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